1. PHYLUM: ARTHROPODA arthro – Greek for JOINTED poda – Greek for FOOT JOINTED FEET!!!

2. THE KEY FEATURE OF ARTHROPODS An exoskeleton

3. EXOSKELETON Does not grow so the arthropods must molt http://www.youtube.com/watch?v=n6iQ96emYE0 http://www.youtube.com/watch?v=ngebZ6n1vVY

4. MOLTING

5. NOTICE THE HOLE?

6. OTHER FEATURES: Malpighian tubules – excretion Many have complex nervous systems Better eyes Sensory abilities Social abilities Antennae Open circulatory system Hemocoel is the major body cavity

7. MORE FEATURES Tracheal system – respiratory system connected to the atmosphere Fertilization is mostly internal Some eggs hatch into adult looking form Some have a larval stage which doesn’t resemble the adult Metamorphosis!!

8. FOUR SUBPHYLA Trilobitmorpha Trilobites Chelicerata Arachnida (spiders, scorpions, ticks, mites) Crustacea Lobsters, crabs, and crayfish Uniramia Myriapods and insects

9. TRILOBITES ARE EXTINCT

10. CHELICERATES HAVE NO ANTENNAE

13. CRUSTACEA 2 pairs of antennae 3 pairs of appendages around the mouth Modified body appendages for walking and swimming Branched appendage

14. CRUSTACEA

16. UNIRAMIA Uniramous Jointed but UNBRANCHED appendages

17. UNIRAMIA - MYRIAPODS Millipedes and centipedes

18. UNIRAMIA: INSECTS!!!! All have 3 pairs of legs (6 feet) on the thorax All have a single pair of antennae All have a pair of compound eyes

27. ECOLOGICAL ROLES + pollinate many of the world’s plants (integral part of agriculture) “If the bee disappeared off the surface of the globe man would only survive for four years” – Albert Einstein + arthropod predators kill pest organisms by the millions + direct/indirect food source for countless organisms + lobsters, crab, crayfish and shrimp are an important food source for humans